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https://github.com/trezor/trezor-firmware.git
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42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "random_delays.h"
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#include "common.h"
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#include "rng.h"
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#include "util.h"
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void wait_random(void) {
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int wait = random32() & 0xff;
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volatile int i = 0;
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volatile int j = wait;
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while (i < wait) {
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if (i + j != wait) {
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shutdown();
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}
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++i;
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--j;
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}
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// Double-check loop completion.
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if (i != wait || j != 0) {
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shutdown();
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}
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}
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